Comparison of Three Methods for Estimating Leaf Area Index of Upland Rice Cultivars
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Nondestructive estimation of leaf area index (LAI) using two canopy analyzers (LAI-2000 and SunScan) was compared with destructively measured LAI for four upland rice (Oryza spp.) cultivars with various types of canopy development during the period from 21 to 56 d after sowing (DAS). For the LAI-2000, LAI was estimated with or without the wide angle reading (Ring 5). When data from 50 and 56 DAS, which included LAI measured destructively of >4 m(2) m(-2), were omitted, the relationship of LAI measured destructively with LAI estimated by the SunScan was highly significant (R-2 = 0.96) and had lower root mean square error than that with LAI estimated by the LAI-2000 without Ring 5. We conclude that by restricting the range of LAI to <4 m(2) m(-2), the SanScan can provide reasonable estimates of LAI.
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